<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <title>购物车</title>
</head>
<body>
<div class="app-container" id="app">
  <!-- 顶部banner -->
  <div class="banner-box"><img src="./img/fruit.jpg" alt="" /></div>
  <!-- 面包屑 -->
  <div class="breadcrumb">
    <span>🏠</span>
    /
    <span>购物车</span>
  </div>
  <!-- 购物车主体 -->
  <div class="main">
    <div class="table">
      <!-- 头部 -->
      <div class="thead">
        <div class="tr">
          <div class="th">选中</div>
          <div class="th th-pic">图片</div>
          <div class="th">单价</div>
          <div class="th num-th">个数</div>
          <div class="th">小计</div>
          <div class="th">操作</div>
        </div>
      </div>
      <!-- 身体 -->
      <div class="tbody">
        <div :class="{tr:true,active:item.isChecked}" v-for="(item, index) in fruitList" :keys="item.id">
          <!-- :checked 控制checkbox是否勾选-->
          <div class="td"><input type="checkbox" v-model="item.isChecked"/></div>
          <div class="td"><img :src="item.icon" alt="" /></div>
          <div class="td">{{item.price}}</div>
          <div class="td">
            <div class="my-input-number">
              <button class="decrease" @click="reduce(index)" :disabled="item.num <= 1"> - </button>
              <span class="my-input__inner">{{item.num}}</span>
              <button class="increase" @click="add(index)"> + </button>
            </div>
          </div>
          <div class="td">{{item.price * item.num}}</div>
          <div class="td"><button @click="del(item.id)">删除</button></div>
        </div>
      </div>
    </div>
    <!-- 底部 -->
    <div class="bottom">
      <!-- 全选 -->
      <label class="check-all">
        <input type="checkbox" v-model="checkAll" />
        全选
      </label>
      <div class="right-box">
        <!-- 所有商品总价 -->
        <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{amount}}</span></span>
        <!-- 结算按钮 -->
        <button class="pay">结算( {{total}} )</button>
      </div>
    </div>
  </div>
  <!-- 空车 -->
  <div class="empty">🛒空空如也</div>
</div>
<script src="js/vue-2.7.14.js"></script>
<script>
  const app = new Vue({
    el: '#app',
    data: {
      // 水果列表
      fruitList: JSON.parse(localStorage.getItem('fruitList')) || [
        {
          id: 1,
          icon: './img/火龙果.png',
          isChecked: true,
          num: 2,
          price: 6
        },
        {
          id: 2,
          icon: './img/荔枝.png',
          isChecked: false,
          num: 7,
          price: 20
        },
        {
          id: 3,
          icon: './img/榴莲.png',
          isChecked: false,
          num: 3,
          price: 40
        },
        {
          id: 4,
          icon: './img/鸭梨.png',
          isChecked: true,
          num: 10,
          price: 3
        },
        {
          id: 5,
          icon: './img/樱桃.png',
          isChecked: false,
          num: 20,
          price: 34
        },
      ]
    },
    methods:{
      del(id){
        this.fruitList = this.fruitList.filter(item => item.id !== id)
      },
      reduce(index){
        this.fruitList[index].num--;
      },
      add(index){
        this.fruitList[index].num++;
      }
    },
    computed:{
      // 总数量
      total(){
        let result = this.fruitList.filter(item => item.isChecked)
        return result.reduce((total, current) => {
          return total + current.num
        }, 0)
      },
      // 总金额
      amount(){
        let result = this.fruitList.filter(item => item.isChecked)
        return result.reduce((total, current) => {
          return total + current.price * current.num
        }, 0)
      },
      checkAll: {
        get(){
          let result = this.fruitList.every(item=> item.isChecked === true);
          return result
        },
        set(value){
          this.fruitList.forEach(item => {
            item.isChecked = value
          })
        }
      }
    },
    watch:{
      fruitList:{
        handler(val){
          localStorage.setItem('fruitList', JSON.stringify(val))
        },
        deep: true
      }
    }
  })
</script>
</body>
</html>
